Design and Implementation of Forced Air-cooled, 140kHz, 20kW SiC MOSFET based Vienna PFC

In this paper, a forced air-cooled, 140kHz, 20kW SiC MOSFET based Vienna power factor rectifier (PFC) is presented. Compared with Si device, the wide bandgap (WBG) semiconductor device allows to increase the switching frequency and reduce the volume of passive components. The modulation scheme of T-type converter is implemented in Vienna PFC to reduce the switching loss and improve efficiency to 98.5%. Power semiconductor device losses are calculated for thermal design. The new phase-change thermal material and AlN thermal interface are used to decrease the thermal impedance. For EMI filter design, a feedback damping resistor is added to common-mode loop to improve the phase margin and stability. Experimental results verify the design concepts and high efficiency.